noun the number of organisms of a particular kind as a percentage of the total number of organisms of a given area or community; the number of birds of a particular species as a percentage of the total bird population of a given area

noun, Optics. 1. the ratio of the diameter of a lens, especially a camera lens, to the focal length; the reciprocal of the f number or focal ratio of the lens. relative aperture noun 1. (photog) the ratio of the equivalent focal length of a lens to the effective aperture of the lens; written as […]

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